Cpanel disk space problem

I m adding two new hard drive of 250gb in my vds i mount it sucessfully and its working bit m creating accounts in /home2 directory and its working but my users cpanel account useddisk space is showing 0/unlimitedmb
but they have 30to 50 gb data in his site but dsk space is not showing in cpanel sir so how to solve it i want to show user usage disk space

Additionally, if this is a VPS, has the provider enabled quotas on your container? In a VPS environment such as Virtuozzo or OpenVZ, the main node must enable user level quotas on your container instance: